IMO the reason CC uses 10 awg wire is because they use aluminum wire not the best conductor, if they used copper stranded wire they would be able to get away with 14-12 awg, and I dont think they need 6.5mm connectors especially if you are running more than 4s you could use 5.5 mms and be fine...you cant fit 10 awg wire in a 4mm connector unless you remove some strands, and another factor to look at is the "C" rating this is the amount x your capicity will be your possible output depending on your motors demand